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  <script>
    // js 弱数据类型的语言
    // let num = 'pink'
    // let num = 10.11
    // console.log(num)
    console.log(1 + 1)
    console.log(1 * 1)
    console.log(1 / 1)
    console.log(5 % 3)
    // java 强数据类型的语言 int num = 10

    // NaN => not a number
    // console.log('我是帅哥' - 2) // NaN
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